Based on: I'm assuming that you're on a trail going up 2,300' as well as down 2,300' (not up 1,150, down 1,150' for a total of 2,300') and just to make it easy it all averages out to about 11% grade. At a moderate effort, at 1:12 total, you'll probably use about 40 minutes going up and 32 doing down. At that rate you climb about 57.5' per minute and for 50 minutes you'd climb 2,875' at an 11% grade. So, why do I think you're fast? Because that would be a 50 minute ascent up Round Mtn, the last CO TT done about 5 weeks ago on Memorial Day, that day you would have ran between Sir Nick and Lucho! Sure, my math isn't going to equate, but if I'm in the ball park GO DO A RACE and kick some ass